JAVA - hibernate - 在 DAO 中创建新查询

Question

您好，我在使用 hibernate 创建动态查询时遇到一些问题:

@SuppressWarnings("unchecked")
public List<EnvironmentConfiguration> findEnviromentProperty(String environment) {
    EntityManagerHelper.log(
            "finding property EnvironmentConfiguration instances", Level.INFO,
            null);
    try {
        final String queryString = "(select e.name as environment,\n" + 
                "       SUBSTRING_INDEX(ec.name ,'.',-1) as property,\n" + 
                "       ec.value \n" + 
                "from pkca_test_db.ENVIRONMENT e, pkca_test_db.ENVIRONMENT_CONFIGURATION ec\n" + 
                "where e.ID=ec.ID_ENVIRONMENT      \n" + 
                "and e.name=" + environment +"= :propertyValue )\n" + 
                "union \n" + 
                "(select b.name  as environment,\n" + 
                "       SUBSTRING_INDEX(bc.name ,'.',-1) as property,\n" + 
                "       bc.value \n" + 
                "from pkca_test_db.ENVIRONMENT b, pkca_test_db.ENVIRONMENT_CONFIGURATION bc\n" + 
                "where b.ID=bc.ID_ENVIRONMENT  \n" + 
                "and b.id=1) ;";
        Query query = getEntityManager().createQuery(queryString);
        query.setParameter("propertyValue", environment);
        return query.getResultList();
    } catch (RuntimeException re) {
        EntityManagerHelper.log("find all failed", Level.FATAL, re);
        throw re;
    }
}

这个值 e.name="+environment +"= :propertyValue 必须由一个参数组成。查询语法是否有错误？

谢谢

Answer 1

我不明白你想在那里做什么。您的情况下的查询将类似于 ...e.name=*value*= :propertyValue...。

也许你想做的是 ...e.name="+ 环境 + "联合。